6 Boxfield, Welwyn Garden City, AL7 4PT

6 Boxfield is a three-bedroom mid-terrace house in Welwyn Garden City (AL7 4PT). It has a recorded floor area of 73 m² (around 786 sq ft), construction records dating it to 1950-1966 and council tax band C. The latest certificate (October 2012) shows a D (score 67), on the cusp of jumping into the C band. The recommended improvements would lift it to B (score 87), a 2-band jump. The latest certificate is from October 2012, so improvements made since then won't be reflected.

Held since August 1999 — that's 27 years off the open market, well above the local norm. Only one transfer is on record with HM Land Registry, suggesting it has stayed in the same hands for a long time. Today's modelled estimate of £383,000 sits 330.3% above the 1999 sale of £89,000. On a £-per-square-foot basis, the last sale (£113/sq ft) was about 52.1% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 75% of similar EPCs).